Method of manufacturing asphalt and product thereof



particularly, this invention relates to emulsifying fluxes, which are prepared according to this in- Patented Aug. 6, 19 35 METHOD OF MANUFACTURING ASPHALT AND PRODUCT THEREOF Alfred A. Wells, Roselle Park, N. J.,' assignor to Standard Oil Development Company, a corporation of Delaware No Drawing. Application This invention relates to a new and improved method in the art of manufacturing asphalt by blending heavy petroleum hydrocarbons. More vention by blending high melting point asphalt with an-extract derived from a cylinder oil fraction from the same crudefrom which the asphalt was derived or from another crude; the said extract being obtained by extracting with either phenol, sulfur dioxide, furfural or similar solvents.

In refining oils it is often-times necessary or desirable to produce both cylinder stock and asphaltic material from the same crude. This is the case in the distillation of Colombian, coastal and mid-continent crudes as well as others, where, in order to obtain maximum yields of cylinder stock, it is necessary to reduce the asphalt to a high melting point. For many purposes, for example, in the manufacture of asphalt emulsions, etc., it is necessary that the asphaltic material have a comparatively low melting point. In some instances, for example, Colombian crude, the lubricating oil fraction contains comparatively large quantities or organic acidity.

An object of this invention is to produce amaximum yield of a cylinder stock and of an asphalt of low melting point from the same crude.

Another object of this invention is the production of a cylinder oil of low organic acidity.

These and other objects of the invention will be understood by the following description:

A crude oil such as Colombian crude for example, after the removal of the lighter oil fraction, is subjected to further heat to distill the maximum amount of cylinder oil. The cylinder oil fraction is then extracted with sulfur dioxide, phenol or furfural or similar selective solvents to give higher A. P. I. gravity, improved viscosity index and better stability, that is more resistant to oxidation, than other methods of treatment. The extracted material is separated from the solvent and incorporated with the asphaltic residue It is desirable in some cases to redistill the extracted oil so as to give a higher -viscositY blending stock; caustic such as sodium hydroxide may be incorporated during distillation if desired to remove any organic acids or solvent that may still be present in the oil. The characteristics of I finished asphalt will vary with proportions of extract and high melting asphalt. The mixture of asphalt and solvent extract may then be used as such or it may be used in making emulsions upon the addition of caustic soda and oleic acid. Other dis leu By this extracted material melting point asphalt in proper proportion so as to give a final product which is equivalent to or superior to the asphaltic product which would have been obtained on desired melting point. over other asphalts in ing asphalt with a better softening point penetration relationship and also a better softening point ductility relationship.

The penetration characteristics vary with the melting point of the This method allows th trol so that he can vary cial requirements, which up required processing special special requirements. that material extracted from cylinder oil from one crude can be blende sources of a mixture. If desired, the asphalt may also be oxidized.

Another advantage of this method is improving the maximum yield of cylinder stock from different crudes.

Various changes may b of the appended claims in which claim all novelty inherent to the invention as broadly as the prior art permits.

I claim:

1. An asphalt compris residues obtained from solvent extraction 0 of the same petroleum oil that .is liquid at atmospheric perature, of the group consisting of phenol and furfural.

2. A method of manufac comprises subjectin separating the ligh fractions from an asphaltic residue, subjecting the higher boiling fractions to solvent extraction with an organic solvent pheric pressure and consisting of phenol and extracted material from the extracted material 3. A method comprises subjectin September 1, 1932, Serial No. 631,369 a 6 Claims. (Cl. 196-74) m oil containing idue'.

tillation to separa emulsifying agents other than caustic soda and oleic acid may be substituted.

method, it has been found that the can be blended with high straight reduction to the This product is superior that it is a better emulsifye made within the scope it is desired to ing a mixture of asphaltic the distillation of petroan extract obtained from a f the higher boiling fractions with an organic solvent pressure and temturing asphalts which g a crude oil to distillation, ter and. the higher boiling that is liquid at atmostemperature, of the group furfural, separating the the solvent and mixing with the said asphaltic of manufacturing asphalts which g a crude petroleum ,oil to te the lower and higher boilmg fractions from the esphaltic material ent in the crude, extracting by the use of orgemc incorporating the tracted material. 

